Abreu M, Tyndall D A, Ludlow J B
Department of Somatology, Federal University of Santa Catarina School of Dentistry, Florianopolis, Brazil.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2001 Nov;92(5):576-81. doi: 10.1067/moe.2001.119146.
The purpose of this study was to determine whether the method of reconstruction of tuned-aperture computed tomography (TACT) slices has an influence on observer performance in caries detection.
Eight images of each of 40 extracted posterior teeth were acquired by using a solid state intraoral detector. Stacks of tuned-aperture computed tomography slices were generated by using the minimum and average reconstruction methods. Slices of the 2 experimental conditions were presented to 8 observers in a balanced order. Images were viewed on a high-resolution 21-in color monitor. Observers scored the presence/absence of caries by using a 5-point confidence scale. Observers' assessments were compared with histologic examinations of tooth sections. Receiver operating characteristic curves measured observers' diagnostic performance. Analysis of variance was used to test for possible significant differences between observers and between experimental conditions. Sensitivity, specificity, accuracy, and interobserver reliability were also calculated.
No statistically significant differences between the 2 methods of reconstruction were found for the detection of either occlusal (P =.07) or proximal (P =.52) caries. Interobserver reliability was similar for both experimental conditions.
The minimum and average methods of TACT reconstruction provide comparable performances for caries detection tasks.
本研究旨在确定调谐孔径计算机断层扫描（TACT）切片的重建方法是否会对龋齿检测中的观察者表现产生影响。
使用固态口腔内探测器获取40颗拔除后牙中每颗牙的8张图像。通过使用最小和平均重建方法生成调谐孔径计算机断层扫描切片堆栈。将两种实验条件下的切片以平衡顺序呈现给8名观察者。在高分辨率21英寸彩色显示器上查看图像。观察者使用5点置信量表对龋齿的存在与否进行评分。将观察者的评估与牙齿切片的组织学检查进行比较。通过受试者操作特征曲线测量观察者的诊断性能。使用方差分析来检验观察者之间以及实验条件之间可能存在的显著差异。还计算了敏感性、特异性、准确性和观察者间可靠性。
对于咬合面龋齿（P = 0.07）或邻面龋齿（P = 0.52）的检测，两种重建方法之间未发现统计学上的显著差异。两种实验条件下的观察者间可靠性相似。
TACT重建的最小和平均方法在龋齿检测任务中提供了可比的性能。
